GAT Subject Engineering MCQs

Frequency is measured in hertz.
It is the reciprocal of the period.

RMS provides an effective value for power calculations.
For a sine wave, RMS equals peak divided by square root of two.

Power factor indicates how effectively current is converted into useful power.
It equals cosine of the phase angle for sinusoidal systems.

Inductive loads draw current that lags voltage.
Motors and transformers commonly produce lagging power factor.

Capacitors supply leading reactive power.
They reduce the reactive current drawn from the source.

KVL follows conservation of energy in a circuit loop.
Voltage rises and drops balance around the loop.

Transformers change voltage and current levels without changing frequency ideally.
They require alternating magnetic flux.

The same current flows through series resistors.
Equivalent resistance equals the sum of individual resistances.

Induced voltage is proportional to the number of turns.
Current changes inversely in an ideal transformer.

Bernoulli relates pressure head, velocity head, and elevation head.
Real-flow applications include head losses.

Reynolds number compares inertial and viscous effects.
Its magnitude helps classify pipe and channel flow regimes.

Coagulants neutralize particle charges and promote floc formation.
The larger flocs can then settle or be filtered.